Pump



D. H. REEVES Oct. 20, 1925- PUMP Filed Dec. 5, 1920 5 Sheets-Sheet 1.

Oct. 20, 1925- p. H. REEVES PUMP 5 Sheets-Sheet 2 \AV 4/4 val Filed Dec. 5, 1920 glvwenfoz oct; 20, 1925'.

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Sunken/mam Patented Oct. 20, 1925.

DONALD H. REEVES, OF DAYTON, OHIO.

PUMP.

Application filed December 3, 1920. Serial No. 428,097.

To all whom it may concern:

Be it known that I, DONALD H. Rnnvms, citizen of the United States, residing at Dayton, in the county of Montgomery and State of Ohio, have invented certain new and useful Improvements in Pumps, of which the following is a specification.

My invention relates to mechanically operated pumps especially designed for pumping gasoline and other fluids. The pump hereinafter described and illustrated is especially designed for use on an airplaneto feed fuel from the main reservoir or tank to the carburetor or carburetors or to the gasoline tank from which it flows by gravity to the engine or to the carburetor thereof.

Experience has demonstrated the advantage in an airplane of a mechanically operated pump as a primary means of feeding fuel. One of the main obj ectsof the present invention is to provide a pump which will a not necessitate the use of a gland or packing joint of any kind between the fiuid' chamber and the'operating mechanism. g

A further ob'ject of the invention is to provide means for maintaining discharge pressure of a predetermined maximum without the use, of any relief valveor similar device.

A. further object of the invention is to provide a pump which will maintain a practicaly constant discharge pressure; also one which will maintain a predetermined dis charge pressure'in case one unit should become inoperative.

A further object in view is to provide a pump which may be made practically a part of the engine using the fluid pumped there.- by, the pumping mechanism being driven by the engine.

A further object in view is to provide a pump adapted for use with a supercharger or other apparatus the use of which necessitates the'maintenance of a discharge pressure of a predetermined constant amount.

With the above and other objects in view, the invention consists in the novel construction, arrangement and combination herein fully described, illustrated and claimed.

In the accompanying drawings,

Fig. 1 is a partial vertical section through the pump taken on line 11 of Fig. 3;

Fig. 1s a vertical section-taken in the same direction as Figa 1, on line 2-2 of Fig. 3;

Fig. 3 is a partial vertical section on line 3-3 of Fig. 2; 4

Fig. 4 is a plan View of the pump;

Fig. 5 is a vertical section through the drainage chamber; 1

Fig. 6 is a'diagrammatic view showing the combination with the pump of a drainage chamber and a supercharger.

The pump comprises a base section 1 having a flange 1 by which it may be secured to the engine, to be driven thereby, or to any other desired support. 1116 base section has mounted thereon .a plate 2 on which is placed the pump chamber 2. The plate'2 has guides 3 and bearings 4 fora purpose hereinafter described. The-pump chamber ispermanently secured to the base section 1 .by any suitable fastening means such as shown in the drawings and mounted upon the pump chamber 2 is a manifold 6 comprising an intake passage 7 and a discharge passage 8 Mounted within the pump chamber 2 are two pumps or units each of which comprises a stationary or fixed head 9 secured to the pump chamber and containing an inlet valve lO'and an outlet valve or discharge 7 valve 11, 'the same being normally held against their seats so as to'close the inlet and discharge ports by means of springs 12 and 13 respectively. Each cylinder head also comprises a plurality of holes 14, to permit the liquid to flow back and forth. Attached fixedly to each cylinder head 9 is a bellows 15 which is constructed .wholly 'of thin sheet metal to provide a" flexible corrugated substantially cylindrical wall' which admits of longitudinal compressionand expansion of the bellows as a whole. To the lower end of the bellows 15 there is fastened a dished head or flange member 16, the same being cupped or dished upwardly from the bottom thereof to form a housing for the up er portion of a compression s ring ,1- ,7 whlch acts between the head 16 an the plate 2" at the bottom of the pump chamber; I

Slidably mounted rods 18 are fixedl attached at their upper ends to the hea s 16 and carry rollers 19 which are actuated in a downward direction by means of cams 20 fast on a rotary cam shaft 21. A"wor1'n wheel 22 is fixed 0n the cam shaft 21 and is driven by a worm 23, fast on the pump operating ishaft 2'3 adapted to be driven by any suitable source of power which may consist of a shaft or other part of the engine in connection with which the pump is used. A

drain outlet24= is providedfor draining ofi' the contents of the pump chamber in case of leakage as will presently appean. r a The operation of the pump is-as follows: The. two p mp units or bellows act alternately, one. othe bellows filling while the other is discharging. The action of a singl bellows-or unit is as follows:

. worm 23, whrmwheel 22, cam slia 20, roller 19, rod 18 and head 16. Simulta-' neously the spring 17, iscom 'ressed; The expansion of thesbellows 1 draws liquid fromfthemain reservoir through the intake as'sage7, lifts the valve 10 and draws the iquid through the hoIes "14, filling said bellews Th spring 12 closes thevalve 1(Y when the liquidceases to 110W through it in this direction. 0 The cam 20. has now tufned through 180 degrees. A As the cam-' continues to rotate to-its. original position,

the spring 7 acting through the head 16 domp esses't e bellows 15, forcing-the liquid 7 through'the valve 11 into the discharge pas? sage 8 of the manifold 6 to its destination. The sprlng 13 closesthe valve 11 when the liquid ceases to flow through it in this di'-- rection and thecycle of the pump-is now complete.

Constant discharge pressure is in sured by the'fa'ct that the, pump units. discharge alternately, combined with the fact that, in case the discharge pressure is such that the springs 17 through the rods 18 hold the rollers 19'. against-the cams 20,bellows 15 will-discharge at a. uniform ratedue to the shape oithe cam. In case the pressure "upon .the discharge vaNe 1 1 exceeds or equals the-pressure which .thespringc'an produce within the bellows 15 at any time during its'compression,'said spring 17, of

course, may act no further during this cycle, It will however be fully compressed again When the cam 20 engages and depresses roll e 19. In case the bellows should break or 1 ak within the um chamber, the drain 24 allows the liquidito ow away from and out of the :pum :chamber to be discharged at any desirab epoint. q q r ,l 5

. In order'to' adapt the pump to the supercharging device, it isnecessary to establish communication between the pump chamber and the compression side of the supercharging device shown at A" and also to add a means for draining the pum chamber in case of leakage of one of the ellows. This may be accomplished in the presentembodi- 'ment of my invention by connecting a tube between the drain'outlet and the compression side of the supercharging device, and

another tube between the drain outlet 24 and a drainage chamber B illustrated in detail in Fig. 5. r

meme j The drainage chamber B. comprisesan outlet 26 andan inlet 27 and contains an air tight float 28 acting in con'un ction with. suitable guides 29 in the cham, er B. T At the bottom of the fioat 28 there is a needle valve 30 which cooperates with the seat 31 to close the outlet 262 The inlet 27maybeconnected to the drain; outlet 24 of the pump and also.

other apparatusof the nature referred to.

I Under normal conditions, there will be no liquid in the chamberlB and the pressure from the supercharging device will keep the needle valve 30 against the seat 31 and close the outlet 26.- In case liquid leaks into the r i J a 9 attains certalnheight ther 1n, the float 28 will be lifted, and therefore needle valve will be opened,.allewing the'liquid to drain through the outlet 26. When there'is no demand on the pump and consequently no discharge from the aP PP:

spring-17 being compressed, the parts men- .tioned' remain in such condition, while the driving shaft and cam shaft continue to rotate. This gives automatic pressure regulation.

Since I chamber2 it will flew into the drainamber B andrwhent e levelof liquid p the pump bellows being filled and the -While I have illustrated my invention in.

one embodiment thereof, it should be under;

stood that the same results may be obtained.

in other ways and by other means within the scope of the following claims: What, I claim is:

.1. In a pump, an enclosing pumpbhamhaving arain outlet, two bellows contained 7 in said chamber and'ich having a valved intakeport and a valved discharge port communicating with the exterior of said chamber, and means for simultaneously compressing one bellows and expanding the other bellows, a drainage chamber into which said drain outlet may discharge, and

meansfOr maintain ng an equal pressure in \l v \i A iao both of said chambers greater than atmosother bellows, a self-venting drainage cham- 10 pheric pressure. ber into which saidi drain outlet may dis- 3. In a pump, an enclosed pump chamber charge, and means for maintaining an equal having a drain outlet, two bellows contained pressure in both of said chambers greater 5 in said chamber and each having a valved than atmospheric pressure. v

intake port and a valved discharge port In testimony whereof I have aifixed my- 15 communicatin with the exterior of said signature. chamber, an means for simultaneously a v A compressing one bellows and expanding the DONALD H. REEVES. 

